Some things you can never truly understand unless you actually experience it. The top of that list? Childbirth and motherhood. Also pretty high, as far as I'm concerned, is eczema. If you've spent your life with perfectly smooth skin on your body, it's hard to get what one of those horrid flare-ups is really like. If you have it, you know what I mean. Here are 5 things only an eczema sufferer could truly understand.